drm,i915: Use local_lock/unlock_irq() in intel_pipe_update_start/end()

[    8.014039] BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:918
[    8.014041] in_atomic(): 0, irqs_disabled(): 1, pid: 78, name: kworker/u4:4
[    8.014045] CPU: 1 PID: 78 Comm: kworker/u4:4 Not tainted 4.1.7-rt7 #5
[    8.014055] Workqueue: events_unbound async_run_entry_fn
[    8.014059]  0000000000000000 ffff880037153748 ffffffff815f32c9 0000000000000002
[    8.014063]  ffff88013a50e380 ffff880037153768 ffffffff815ef075 ffff8800372c06c8
[    8.014066]  ffff8800372c06c8 ffff880037153778 ffffffff8107c0b3 ffff880037153798
[    8.014067] Call Trace:
[    8.014074]  [<ffffffff815f32c9>] dump_stack+0x4a/0x61
[    8.014078]  [<ffffffff815ef075>] ___might_sleep.part.93+0xe9/0xee
[    8.014082]  [<ffffffff8107c0b3>] ___might_sleep+0x53/0x80
[    8.014086]  [<ffffffff815f9064>] rt_spin_lock+0x24/0x50
[    8.014090]  [<ffffffff8109368b>] prepare_to_wait+0x2b/0xa0
[    8.014152]  [<ffffffffa016c04c>] intel_pipe_update_start+0x17c/0x300 [i915]
[    8.014156]  [<ffffffff81093b40>] ? prepare_to_wait_event+0x120/0x120
[    8.014201]  [<ffffffffa0158f36>] intel_begin_crtc_commit+0x166/0x1e0 [i915]
[    8.014215]  [<ffffffffa00c806d>] drm_atomic_helper_commit_planes+0x5d/0x1a0 [drm_kms_helper]
[    8.014260]  [<ffffffffa0171e9b>] intel_atomic_commit+0xab/0xf0 [i915]
[    8.014288]  [<ffffffffa00654c7>] drm_atomic_commit+0x37/0x60 [drm]
[    8.014298]  [<ffffffffa00c6fcd>] drm_atomic_helper_plane_set_property+0x8d/0xd0 [drm_kms_helper]
[    8.014301]  [<ffffffff815f77d9>] ? __ww_mutex_lock+0x39/0x40
[    8.014319]  [<ffffffffa0053b3d>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
[    8.014328]  [<ffffffffa00c8edb>] restore_fbdev_mode+0x6b/0xf0 [drm_kms_helper]
[    8.014337]  [<ffffffffa00cae49>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[    8.014346]  [<ffffffffa00caec2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[    8.014390]  [<ffffffffa016dfba>] intel_fbdev_set_par+0x1a/0x60 [i915]
[    8.014394]  [<ffffffff81327dc4>] fbcon_init+0x4f4/0x580
[    8.014398]  [<ffffffff8139ef4c>] visual_init+0xbc/0x120
[    8.014401]  [<ffffffff813a1623>] do_bind_con_driver+0x163/0x330
[    8.014405]  [<ffffffff813a1b2c>] do_take_over_console+0x11c/0x1c0
[    8.014408]  [<ffffffff813236e3>] do_fbcon_takeover+0x63/0xd0
[    8.014410]  [<ffffffff81328965>] fbcon_event_notify+0x785/0x8d0
[    8.014413]  [<ffffffff8107c12d>] ? __might_sleep+0x4d/0x90
[    8.014416]  [<ffffffff810775fe>] notifier_call_chain+0x4e/0x80
[    8.014419]  [<ffffffff810779cd>] __blocking_notifier_call_chain+0x4d/0x70
[    8.014422]  [<ffffffff81077a06>] blocking_notifier_call_chain+0x16/0x20
[    8.014425]  [<ffffffff8132b48b>] fb_notifier_call_chain+0x1b/0x20
[    8.014428]  [<ffffffff8132d8fa>] register_framebuffer+0x21a/0x350
[    8.014439]  [<ffffffffa00cb164>] drm_fb_helper_initial_config+0x274/0x3e0 [drm_kms_helper]
[    8.014483]  [<ffffffffa016f1cb>] intel_fbdev_initial_config+0x1b/0x20 [i915]
[    8.014486]  [<ffffffff8107912c>] async_run_entry_fn+0x4c/0x160
[    8.014490]  [<ffffffff81070ffa>] process_one_work+0x14a/0x470
[    8.014493]  [<ffffffff81071489>] worker_thread+0x169/0x4c0
[    8.014496]  [<ffffffff81071320>] ? process_one_work+0x470/0x470
[    8.014499]  [<ffffffff81076606>] kthread+0xc6/0xe0
[    8.014502]  [<ffffffff81070000>] ? queue_work_on+0x80/0x110
[    8.014506]  [<ffffffff81076540>] ? kthread_worker_fn+0x1c0/0x1c0

Signed-off-by: Mike Galbraith <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: linux-rt-users <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

drivers/gpu/drm/i915/intel_sprite.c

@@ -36,6 +36,7 @@
 #include <drm/drm_rect.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_plane_helper.h>
+#include <linux/locallock.h>
 #include "intel_drv.h"
 #include "intel_frontbuffer.h"
 #include <drm/i915_drm.h>
@@ -67,7 +68,7 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
 }
 
 #define VBLANK_EVASION_TIME_US 100
-
+static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock);
 /**
  * intel_pipe_update_start() - start update of a set of display registers
  * @crtc: the crtc of which the registers are going to be updated
@@ -102,7 +103,7 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
 						      VBLANK_EVASION_TIME_US);
 	max = vblank_start - 1;
 
-	local_irq_disable();
+	local_lock_irq(pipe_update_lock);
 
 	if (min <= 0 || max <= 0)
 		return;
@@ -132,11 +133,11 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
 			break;
 		}
 
-		local_irq_enable();
+		local_unlock_irq(pipe_update_lock);
 
 		timeout = schedule_timeout(timeout);
 
-		local_irq_disable();
+		local_lock_irq(pipe_update_lock);
 	}
 
 	finish_wait(wq, &wait);
@@ -201,7 +202,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc)
 		crtc->base.state->event = NULL;
 	}
 
-	local_irq_enable();
+	local_unlock_irq(pipe_update_lock);
 
 	if (intel_vgpu_active(dev_priv))
 		return;